/* Event loop machinery for GDB, the GNU debugger.
- Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2000, 2001, 2002, 2005, 2006, 2007, 2008
+ Free Software Foundation, Inc.
Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "event-loop.h"
#include <sys/time.h>
#include "exceptions.h"
#include "gdb_assert.h"
+#include "gdb_select.h"
typedef struct gdb_event gdb_event;
typedef void (event_handler_func) (int);
if (gdb_result == 0)
{
+ /* If any exception escaped to here, we better enable
+ stdin. Otherwise, any command that calls async_disable_stdin,
+ and then throws, will leave stdin inoperable. */
+ async_enable_stdin ();
/* FIXME: this should really be a call to a hook that is
interface specific, because interfaces can display the
prompt in their own way. */
}
}
-/* Wrapper for select. This function is not yet exported from this
- file because it is not sufficiently general. For example,
- ser-base.c uses select to check for socket activity, and this
- function does not support sockets under Windows, so we do not want
- to use gdb_select in ser-base.c. */
-
-static int
-gdb_select (int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
- struct timeval *timeout)
-{
-#ifdef USE_WIN32API
- HANDLE handles[MAXIMUM_WAIT_OBJECTS];
- HANDLE h;
- DWORD event;
- DWORD num_handles;
- int fd;
- int num_ready;
-
- num_handles = 0;
- for (fd = 0; fd < n; ++fd)
- {
- /* EXCEPTFDS is silently ignored. GDB always sets GDB_EXCEPTION
- when calling add_file_handler, but there is no natural analog
- under Windows. */
- /* There is no support yet for WRITEFDS. At present, this isn't
- used by GDB -- but we do not want to silently ignore WRITEFDS
- if something starts using it. */
- gdb_assert (!FD_ISSET (fd, writefds));
- if (FD_ISSET (fd, readfds))
- handles[num_handles++] = (HANDLE) _get_osfhandle (fd);
- }
- event = WaitForMultipleObjects (num_handles,
- handles,
- FALSE,
- timeout
- ? (timeout->tv_sec * 1000 + timeout->tv_usec)
- : INFINITE);
- /* EVENT can only be a value in the WAIT_ABANDONED_0 range if the
- HANDLES included an abandoned mutex. Since GDB doesn't use
- mutexes, that should never occur. */
- gdb_assert (!(WAIT_ABANDONED_0 <= event
- && event < WAIT_ABANDONED_0 + num_handles));
- if (event == WAIT_FAILED)
- return -1;
- if (event == WAIT_TIMEOUT)
- return 0;
- /* Run through the READFDS, clearing bits corresponding to descriptors
- for which input is unavailable. */
- num_ready = num_handlers;
- h = handles[event - WAIT_OBJECT_0];
- for (fd = 0; fd < n; ++fd)
- {
- HANDLE fd_h = (HANDLE) _get_osfhandle (fd);
- /* This handle might be ready, even though it wasn't the handle
- returned by WaitForMultipleObjects. */
- if (FD_ISSET (fd, readfds) && fd_h != h
- && WaitForSingleObject (fd_h, 0) != WAIT_OBJECT_0)
- {
- FD_CLR (fd, readfds);
- --num_ready;
- }
- }
- /* We never report any descriptors available for writing or with
- exceptional conditions. */
- FD_ZERO (writefds);
- FD_ZERO (exceptfds);
-
- return num_ready;
-#else
- return select (n, readfds, writefds, exceptfds, timeout);
-#endif
-}
-
/* Called by gdb_do_one_event to wait for new events on the
monitored file descriptors. Queue file events as they are
detected by the poll.
file_event_ptr = create_file_event (file_ptr->fd);
async_queue_event (file_event_ptr, TAIL);
}
+ file_ptr->ready_mask = (gdb_notifier.poll_fds + i)->revents;
}
-
- file_ptr->ready_mask = (gdb_notifier.poll_fds + i)->revents;
}
#else
internal_error (__FILE__, __LINE__,
return async_handler_ptr;
}
+/* Call the handler from HANDLER immediately. This function runs
+ signal handlers when returning to the event loop would be too
+ slow. */
+void
+call_async_signal_handler (struct async_signal_handler *handler)
+{
+ (*handler->proc) (handler->client_data);
+}
+
/* Mark the handler (ASYNC_HANDLER_PTR) as ready. This information will
be used when the handlers are invoked, after we have waited for
some event. The caller of this function is the interrupt handler
else
{
prev_ptr = sighandler_list.first_handler;
- while (prev_ptr->next_handler != (*async_handler_ptr) && prev_ptr)
+ while (prev_ptr && prev_ptr->next_handler != (*async_handler_ptr))
prev_ptr = prev_ptr->next_handler;
prev_ptr->next_handler = (*async_handler_ptr)->next_handler;
if (sighandler_list.last_handler == (*async_handler_ptr))
projects / deliverable / binutils-gdb.git / blobdiff